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Belinda Sagoe ∙
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If you mean: x+y = 30 and the value of y is 15 then the value of x is also 15
x is 45.
x is 0.8
If: 2x-3y = -15 and x = 4y Then: x = -12 and y = -3
X = 135 and y = 15 Solved by addition and substitution